A Spanish website, BitDreams has published what it claims to be the spec list for the upcoming next-gen Dual-GPU, the HD 8990

The Venus XTX HD 8990, which is basically two Radeon 8970's bound to a single GPU, which sport; 5.1 billion transistors, 5210 stream processors and 160 texture units per core. The roadmap also states HD 8990 will feature 48 ROPs per core, and two 384-bit buses. Memory between 6GB and 12GB and should come factory clocked at 1250MHz. The GPU cores should be set at 950MHz if all this is to be believed. However, we have heard of the new GPU's being called something else behind closed doors and not the obvious 8 or 9000 series

The leak suggests that we should expect to see this monstrous chip in Q2 2013, which, by my calculations, means soon!